MATLAB: How to matrix combine adjacent row to be a new matrix

add adjacent row datacombine matrix

I have a 2000*5000 matrix, i want to add every 2 row data to combine a new row that become 2000*2500 matrix. To simplify question ,i use a A=5*8 matrix for instance,HOW TO BECOME B=5*4 matrix,thanks for your help.
A=[0.02  0  0  0  0  0  0.0104  1.2  ;
 1.02  0  0  3  0  0  0.0104  1.2  ;
 4.02  1  0  2  0  0  0.0104  1.2  ;
 2.02  0  2  0  0  0  0.0104  1.2  ;
 0.02  1  0  8  0  0  0.0104  1.2  ;]
B=[0.020  0  0  1.2104  ;
 1.020  3  0  1.2104  ;
 5.020  2  0  1.2104  ;
 2.020  2  0  1.2104  ;
 1.020  8  0  1.2104  ;]
Because my matrix is huge,i would like to do less for loop,thanks.

Best Answer

B=A(:,1:2:end)+A(:,2:2:end)
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